The thermal water has such constitutive and action properties, that the bathing therapy becomes one of the main thermal therapies performed. Thanks to its special structure, in the bathing therapy the thermal water performs the curative action through special stimuli that are, in particular: caloric actions, mechanical stresses, physical-chemical and chemical actions. As far as the caloric component is concerned, it should be said that, since the water has the highest specific heat, a low conductivity coefficient and the possibility of being used in large quantity, it performs a high heat retention capacity. The bodies having high heat retention capacity are very useful in therapeutic practice, since they can transmit the heat in its best form: with progression, without sudden leaps, thus avoiding rough and immediate heat charges in the tissues, which they are put in contact with.